Improvement in machines for shaping the heads of metal screws



I M. SPENCER.

Machine for Shaping the Heads uf Metal Screws. ,No.16'6,423.

Patented Aug. 3,1875.

j m'inessas.

UNITED STATES PATENT FFICE.

CHRISTOPHER M. SPENCER, OF HARTFORD, CONNECTICUT.

- I IMPROVEMENT IN MACHINES FOR SHAPING THE HEADS 0F METAL SCREWS.

Specification forming part of Letters Patent No. 166,423, dated August3, 1875 application filed December 7, 1874.

To all whom it may concern:

Be it known that I, CHRISTOPHER M. SPENCER, of Hartford, in the countyof Hartford and State of Connecticut, have invented certain new anduseful Improvements pertaining to Screw-Making Machines, of which thefollowing is a specification, reference being had to the accompanyingdrawings, where Figure 1 is a top View of a machine embodying my saidimprovements. Fig. 2 is a side elevation of the same, which I will termI a front view. Fig. 3 is a view of the same in vertical cross-section,on the plane at 00, look- ?ing in the direction denoted by the arrow as."Fig. 4 is a crosssection view on the same plane, but looking in theopposite direction.

The machine, as a Whole, is intended for making what are commonly calledmachinescrewsthatis, screws for fastening metallic parts together. Theinvention is an attachment to or part of such machine for forming andfashioning the periphery of the heads of the screws to almost anydesired shape, as round, square, hexagon, octagon, &c.

The letter a denotes. the base; I) b, ways for the block 0, carrying thehorizontally-rotating .ool-stock d; e e, the standards of the headstock,in which is hung the hollow shaft f, wtatcd by a belt running on thepulley g. The stock h is fed through the shaft f, and caused to rotatewith it by appliances which z'orm no part of the present invention. The

rotary tool-stock d has sockets i for different tools as mills forcutting down the body of the stock to the desired size, and dies foroutie; the screw-thread, which can be brought -eear successively uponthe stock by the rotation and longitudinal motion of this toolstock. Oneof these sockets bears upon the end of the stub or rod j the ways-blockk, in which the tool-stock I has longitudinal movement. This tool-stockZ bears the tool m, secured in place by screw n. From this toolstockextends the tappet a, practically a part of the tool-stock I, kept incontact with the periphery of the rotating former 19 on the shaftf bythe spring 1'. If the former p is circular it will cause the tool m tocut a round head on the screw 0; if the former is square, the tool mcuts a square head. The former shown in the drawings is of about theright shape for causingthe tool to cut a hexagon head, and the shape ofthe former can be varied to cut heads of almost any shape. The letter 8denotes the cutting-off tool held in the tool-stock t, which hastransverse motion on the base a in ways 20. This tool is used to severthe finished screw from the stock at the proper time.

I claim as my invention 1. The combination of the hollow rotatingstock-feeding shaft f, the rotating former p, and the vibratorytool-stock Z, all substantially as shown and described.

2. The combination of the hollow stockholding shaft f, the rotatingformer p, the ways-block k, the t00l-stock l, and the tool m, allsubstantially as shown and described.

3. The combination of the slide 0, rotating head cl, ways-block 7c,reciprocating tool-holder Z, and rotating former 1), all operatingsubstantiaiiy as shown and described.

CHRISTOPHER M. SPENCER.

Witnesses:

WM. E. Smonns, O. A. GRIFFIN.

